Flexible tubing.



- A. SUNDH. FLEXIBLE 1u'B|NG. APPLICAUON FlLED 3AN.26.1918.

Patented Feb. 25, 19H).

"entran enligne rnrnnr AUGUST SUNDI-I, OF HASTINGS-UPON-HUDSON, NEVIYORK, ASSIGNOR TO NATIONAL CLUTCH CO., INC., OF NEW YORK, Y., ACORPORATION 0F NEW YORK.`

FLEXIBLE TUBING.

Specification. of Letters Patent.

Patented Feb. 25, 1919.

Application filed January 26, 1918. Serial No. 213,975.

To all whom t may concern.'

Be it known that I, AUGUST SUNDH, a citizen of the United States,resident of Hastings-upon-Hudson, in the county of Westchester and Stateof New York, have invented certain new and useful Improvements inFlexible Tubings, of which the following is a specification.

My invention relates to an improvement in flexible metallic fluid tighttubing. It is an object thereof to provide a flexible tubing which willbe con'nnercially practicable and capable of conveying fluids under highpressure and of withstanding rough usage without rupture or collapse, orpermanent distortion, and suitable for fluid connectors between railroadcars, and other purposes.

rllhe present structure comprises a metal strip having corrugationstherein in the form of alternately inwardly and outwardly extendingloops. This strip is wound spirally with its adjacent edges abutting toform other corrugations in the form of loops preferably somewhat widerthan the corru gations rst mentioned, to which I rigidly secure theconvolutions of a wire spiral or holder. This holder which may be of anysuitable cross section is stid enough to control the metal strip so thatthe corrugations thereof to which it is attached will always bemaintained in their proper form, and when the tubing is bent will bemaintained properly spaced and proportionately flexed. In other words,the tubing is capable of conveying fluids under high pressure and willwithstand rough usage without danger of rupture or collapse or permanentdistortion.

The holder is formed with'a groove in the convolutions thereof intowhich the abutting edges of the strips may be forced in any suitablemanner, so that they will be maintained rigidly secured thereto to forma Huid tight structure. If desired, the groove in the holder may beformed to be self-binding, or for that matter'the edges of the strip maybe soldered or welded in place. In other words, it is within the scopeof the present invention to secure the strip to the holder in anydesired manner so long as the two are rigidly joined together. Thenumber of corrugations formed in the strip before being wound may bevaried to suit various situations, and likewise the holder may besecured to the inwardly extending loops of the strip, nor the outwardlyextending loops as may be desired.

In the accompanying drawings, wherein are illustrated two embodiments ofmy inrention- Figure l isa part sectional elevational view showing oneform of the invention, and

Fig. 2 is a part sectional elevational view of a modification.

Referring to the drawings in detail, l

' designates a metal strip having corrugatipns Q formed therein, in theshape of alternately inwardly and outwardly extending loops. This stripis wound spirally with adjacent edges abutting to form othercorrugations or loops 3, which are forced into a groove formed in theinner side of the convolutions of a wire spiral or holder t, to form arigid connection thereto and a iiuid tight joint. riheholder il issufficiently stiff to control the movement of the strip l. If desired,the edges of the strip may be soldered or welded to the holder orrigidly secured thereto in any other suitable ina-nner.

It will be obvious, therefore, that the structure so far describedprovides a flexible liuid tight tubing controlled by the holder, so thatthe corrugations to which the holder is secured will be proportionatelyflexed, and always maintained properly spaced and in proper form. It isapparent also that the tubing will convey fluid under pressure withoutleakage, and without danger of rupture, collapse or permanent distortiondue to externa-land internal pressures and rough usage.

The modification of Fig. 2 comprises a inetal strip l havingcorrugations 2 formed therein, in the shape of alternately inwardly andoutwardly extending loops. This strip is wound spirally with adjacentedges abutting and forced into a groove formed in the outer surface of awire spiral or holder 4. It will be noticed in this modification thestrip is attached to the outside surface of the holder and that thereare fewer corrugations in the strip between the convolutions of theholder than in Fig. l. This structure will possess greater tensilestrength than the device of Fig. l, but the structure of Fig. l will bethe more flexible.

I wish not to be limited to the exact deas obviously zthose skilled inthis artrcould make Changes therein Within the scope of this invention.

llVliat I claim as-new is 1. A Ylexiblef'tlibing comprising a sprally-Wound corrugated metal strip, and a spirally Wound relatively rigidmember to uvhich the strip is rigidly secured, the corrugated striphaving a plurality 0f complete corrugations between the points ofattachment of the two members to each other.

'2. A flexible tubing comprising a spirallywound .corrugated metalstrip, and a spiral, relatively rigid, slotted member, the adjacentedges ot' the corrugated strip being rigidly held in the slot oftheslotted member, the rorrugated member having a plurality of completecorrugations between the points of attachment of the tivo members toeaeh other.

3. A flexible tubing comprising a spirallywound Corrugated metal strip,and an exter nal spiral slotted member to Which the adrigidly secured,the corrugated member having a plurality of complete corrugationsbetween the points of attachment of the two members t0 each other.

l. A'flexible'tubing comprising a spirallywound metal strip having aplurality of complete corrugations, and an external rela- `ia'eent edgeso the corrugated strip are' tively rigid spiral slotted member to whichthe adjacent edges o'l the corrugated strip are rigidly secured.

5. rThe method of making flexible metal-lio tubing consisting in spiral]y Windii'ig a strip having a plurality et complete eorrugations andrigidly .securing the same to a spirally- .wound relatively rigidmember.

t. The method ot making flexible metalli@ tubing eeusisting ineorrugating a flat metal strip to Lt'orm a plurality of completeCorrugatious and spirally winding the saine to brine' adjacent edgesthereof together, and securing the edges to a relatively rigidspiralllvivouml member.

T. rthe method ot making flexible metallic tubing tonsisting in spirallyWinding a cor-V rugated strip having a plurality of completecorrugations, to bring adjacent edges thereof together, Hanging suehedges and securing the flanges to a relatively rigid spirallywoundslotted member.

8. In a Vflexible metallic tubing the combination of a u'ire spiral anda spiral of diaphragmatio i'uaterial formed in a loop and rigidlyattached to the wire spiral, the oonvolutions of the Wire spiralextending in depth substantially equal to the depth of the loop ot' thediaphragmatic spiral.

AUGUST SUNDH.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washingtom). C.

